Some dogs will naturally offer subtle challenges to your authority when they first join your household. (uvma.org)
On the other hand if the law required the IRS to release tax returns I can see some incredible opportunities for challenges to the authority of the IRS and other issues that would arise. (politics.stackexchange.com)
It's hard to maintain unity when differences in theology are met with accusations of heresy, and challenges to certain interpretations of the Bible are dismissed as challenges to its authority. (rachelheldevans.com)